He and others were concerned that if the rural outbreaks, however small, were not quickly suppressed the virus could become persistent, travelling with people back and forth between the city and the jungle.
Despite some progress since 2009, persistent roadblocks to free travel and investment make it difficult for interested private parties to build enduring bilateral ties.
Wandertab addresses one of the most persistent problems that afflicts travel startups, which is that they don't get the same kind of daily use that other consumer Internet or mobile products see.
Serfdom was all around him then: ration books, travel restrictions, the persistent shadow of wartime central planning, and most of all the depressing disposition of people to do what they were told and to suppose that this was modern life.
The international treaty went into effect in 2004; participants have banned the use of persistent organic pollutants (POPs) that travel across the planet, by air and by sea, starting with the so-called Dirty Dozen (DDT included).
We identify the control inputs that steer the aircraft from the initial fix to the final fix following a horizontal route of waypoints while performing step climbs and descents, in order to minimize the overall flying cost of fuel consumption, CO2 emissions, passenger travel time, and persistent contrail formation.
Persistent organic pollutants (POPs) can travel thousands of miles, accumulate in the food chain, and persist in the environment, taking as long as centuries to degrade.
Our ongoing groundwater research has recently documented that excreted natural estrogens and EDCs do leach from septic systems into groundwater, and they travel and are persistent in the Cape Cod aquifer[ 39].
They are persistent organic pollutants that dissolve slowly, travel easily and are absorbed by living organisms, including humans.
Persistent heavy showers throughout Tuesday led to travel disruption.
